#何子轩
class People:
    def __init__(self, name, age):
      self.name = name
      self.__age = age
    def __sayHello(self):
        print('Hello,大家好')
    def greeting(self):
        self.__sayHello()
    def getAge(self):
        return self.__age
xiaolan = People('小蓝', 10)
xiaolan.greeting()
print('我叫{}，今年{}岁了。'.format(xiaolan.name,xiaolan.getAge()))

class Animal:
     type = '动物'
     food = '食物'
     def eat(self):
        print('{}吃{}'.format(self.type, self.food))
class Cat(Animal):
     pass
cat = Cat()
cat.eat()
cat.type = '猫'
cat.food = '鱼'
cat.eat()
